| article html file updated | 7 February 2020 09:10 CET | Update | https://www.mdpi.com/1996-1073/9/6/391 |
| article html file updated | 5 May 2019 14:53 CEST | Update | - |
| article html file updated | 27 March 2019 05:34 CET | Update | - |
| article html file updated | 28 June 2016 09:18 CEST | Update | - |
| article html file updated | 24 May 2016 08:38 CEST | Original file | - |
| article xml uploaded. | 24 May 2016 08:37 CEST | Original file | https://www.mdpi.com/1996-1073/9/6/391/xml |
| article pdf uploaded. | 24 May 2016 08:37 CEST | Version of Record | https://www.mdpi.com/1996-1073/9/6/391/pdf |
